Determine the margin of error for a 99% confidence interval to estimate the population proportion with a sample proportion equal to 0.60 for the following sample sizes. a. nequals125 b. nequals220 c. nequals250 click the icon to view a portion of the cumulative probabilities for the standard normal distribution table. a. the margin of error for a 99% confidence interval to estimate the population proportion with a sample proportion equal to 0.60 and sample size nequals125 is nothing. (round to three decimal places as needed.)